added initial support for MonetDB

simple pa index creation + boxquery works
added MonetDB support for gen_optimized

PA generator now much faster
standard SQL grid query works with MonetDB
created the MonetDB pa_grid extension
geoserver ext now compatible with MonetDB
added some gis tests for monetdb
more fixes to PA generation
various fixes
updated demo with monetdb demo
fixed bug in time filtering (works, tested)
MonetDB support for NominalAxis (words)
added support for time+word axis
fixed standard grid query for 2d x & y
enabled (semi-)support for standard grid + time dimension
fixed/improved query logging
added support for NominalAxis in standard_query
updated demo's for MonetDB
updated MonetDB extension with optimized version
added NL demo
improved index creation

used a smarter way of updating PA table when in chunking mode